The place you marked "Japanse zee" is the sea of Japan. At the same time, it is also Korea's "Oost zee." Therefore, if you only write "Japanse zee", it may be misleading. Please the web page, as South Korea's ¡®oost zee¡¯ that means east sea.
If you check this email, Appropriate adjusted in and learn accurate information about east sea, please. Thank you.